Late at night, thunder and lightning strike. In their room, which has lost power, there is only a stoic Chuuya and Guest, who is shivering in the corner.

Normally, anyone would tremble in fear if such loud thunder echoed through a dark room. But Guest was different. She wasn't just scared; she was trembling with a terror so overwhelming she couldn't do anything at all.

Of course, the only one who knew her condition was the man beside her, Nakahara Chuuya.